/*
 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jetbrains.plugins.groovy.lang.resolve

import com.intellij.openapi.extensions.ExtensionPointName
import com.intellij.psi.JavaDirectoryService
import org.jetbrains.plugins.groovy.lang.psi.GroovyFile

interface ExpectedPackageNameProvider {

  fun inferPackageName(file: GroovyFile): String?
}

class DefaultExpectedPackageNameProvider : ExpectedPackageNameProvider {

  override fun inferPackageName(file: GroovyFile): String? = file.containingDirectory?.let {
    JavaDirectoryService.getInstance().getPackage(it)?.qualifiedName
  }
}

private val EP_NAME = ExtensionPointName.create<ExpectedPackageNameProvider>("org.intellij.groovy.expectedPackageNameProvider")

fun inferExpectedPackageName(file: GroovyFile): String {
  for (ext in EP_NAME.extensions) {
    val name = ext.inferPackageName(file) ?: continue
    return name
  }
  return ""
}